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a in (-oo:+oo)
7*a-7 = -4*a-106 // + -4*a-106
7*a-(-4*a)-7+106 = 0
7*a+4*a-7+106 = 0
11*a+99 = 0 // - 99
11*a = -99 // : 11
a = -99/11
a = -9
a = -9
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